Agung Purwanto, Ilmi Zajuli Ichsan, Nurfadhilah, Edi Kurniawan, Ahmad Ali, Charanjit Kaur Swaran Singh. “ESBOR: Analysis Students HOTS for Develop Digital Technology in Environmental Learning”. International Journal of Advanced Science and Technology, Vol. 29, no. 04, June 2020, pp. 3896 -, http://sersc.org/journals/index.php/IJAST/article/view/24556.